Podgorica, Montenegro to Crystal Lake is an approximately 17-hour flight. Traveling from Podgorica to Crystal Lake, you'll gain 7 hours due to the time zone difference. In April in Crystal Lake, expect temperatures between 19°C during the day and 4°C at night. Finish your sightseeing early on the 29th (Sun) to allow enough time to travel to Chicago.

Getting from Crystal Lake to Chicago by car takes about 1.5 hours. In April in Chicago, expect temperatures between 18°C during the day and 6°C at night. Wrap up your sightseeing on the 9th (Wed) to allow time to travel to Harrisburg.

You can drive from Chicago to Harrisburg in 5.5 hours. Alternatively, you can fly. In May, plan for daily highs up to 28°C, and evening lows to 15°C. Finish up your sightseeing early on the 14th (Mon) so you can travel to Springfield.

Traveling by car from Harrisburg to Springfield takes 3.5 hours. In May, daytime highs in Springfield are 28°C, while nighttime lows are 15°C. Wrap up your sightseeing on the 20th (Sun) early enough to drive to Utica.

You can drive from Springfield to Utica in 2.5 hours. Other options are to do a combination of flight, shuttle, and taxi; or do a combination of bus, train, and taxi. Expect a daytime high around 26°C in May, and nighttime lows around 12°C. Finish your sightseeing early on the 25th (Fri) so you can travel to Oregon.